Theodoee coopeb



(No Model.)

T. COOPER.

DRAW BRIDGE, TURN TABLE, &c.

No. 350,528. Patented Oct. 12, 1886.

, WITNESSES M Rum L @l w -ix BY Arm/ 57 N. PETERS. Phawuum m hma wnshinginn. D4 0.

UNITED ST TEs PAT NT OFFICE.

THEODORE COOPER, OF NElV YORK,'N. Y.

DRAW-BRIDGE, TURN-TABLE, 86C.

SPECIFICATION forming part of Letters Patent No. 350,528, dated October 12, 1886.

' Application filed March 19, 1886. Serial No. 195,794. (No model.)

more properly termed swing-bridges or turn-tables. v

The invention consists of the parts and combination of parts constituting the mechanism hereinafter described and claimed.

In the accompanying drawings, Figure 1 shows a half cross-section of the turn-table or similar structure; Fig. 2, a portion of the same in plan, each'figure broken so as to illustrate the coned bearing-wheels with their axles, guide rings, and. top and bottom bearingplates all truly centered about a common shaft inserted in the base-casting.

In said figures the severalparts are indicated by letters, respectively, as follows:

The letter a indicates the coned bearingwheels, I) the axles of said wheels, and c the axle-bushings.

The letters d and e,respectively,indicate the outer and inner guide-rings, the lugs f holding the axles b in radial adjustment.

The letter 9 indicates thetop bearing-plate, having centralizing arms or web h, and t the central guiding-shaft.

The letter j indicates the base-casting having the lower bearing-track, 7c.

The bridge, turn-table, or similar structure rests upon and its whole weight is supported by the top bearing-plate, 9. Such structure may be attached to said plate in any manner considered best for each particular case. Its weight may also be distributed over the top bearing-plate in any desired manner. The bearing-wheels, preferably, should be inclined, as shown in Fig. 1, so that the upper bearingplate may be made flat or without any coning, thus cheapening the construction and providing for an automatic adjustment horizonthe filling-washers m and the nuts n at the about the same central shaft, '5, by means of the The axles of the wheels are held radially by being secured in such direction by the lugsf on the inner guide-ring, c,a nd by the bearings in the outer guide-ring. d. Said axles and outer guide-ring are so fitted'that by means of outer'ends of the axles each wheel can be accurately adjustedto auniform bearing. The moving part of the structure and the circular nest of coned wheels are accurately guided webs h and e. The base-casting, preferably made in one piece, rests firmly and t'ruly'upon any selected foundation. The lower bearingtrack, 70, the hub for the central shaft, t, and the bottom surface of the base-casting j can be accurately faced and bored in the lathe or similar machine, so as to insure a true relation between these several surfaces.

While the arrangement of parts shown may I be considered as an improvement upon the Parry Friction-Box, it is a new invention,

and differs from methods heretofore in use for swing-bridges, turn-tables, and similar structures in the following named particulars: First, the parts are all placed beneath the structure, thus avoiding all high castings and suspension devices; second, the parts are all freely open to inspection while either in motion or at rest, thus enabling any irregularities to be discovered, proper adjustments to be made, and any defective parts removed and replaced with the greatest facility; third, from the location of the parts below the structure great latitude is obtained for the selection of the best dimensions of the wheels and their radial distance from the center; fourth, the greater accessibility of all the working-surfaces to be tool-finished in the ordinary appliances or machines in the machine-shop; fifth, from the horizontality of the top bearing-surfaces a perfectly-accurate means is .obtained for setting the working parts-truly before placing the structure thereon; sixth, for locomotive turn-tables, the better attainment of the selfbalancing of the locomotive-engines of different classes and different conditions of loading, by so proportioning the diameter of the centers that the various positions of the center of gravity of the several engines will always fall zontal plane and held truly radial by fixed axles secured to inner and outer guide-rings, as (l e, all combined and arranged beneath said structure, whereby all suspension devices may be dispensed with,and girders carried on top, substantially as and for the purposes set forth.

THEODORE COOPER. Witnesses:

FRANCIS P. REILLY, JOHN TULLY. 

